Question about 2004 Yamaha TT-R 125 L

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2004 ttr-125 bike won't start period. installed new vavles because the exhaust valve was bent, cleaned the carb and timed the cam and piston to TDC. i have the exhaust pipe off so i can hear the valve action. when i kick it, it doen't get firm till half stroke. i put my hand over the carb intake and it has enough sucktion just to notice, every hundred kicks or so, i get a little "pop" of life, them nothing, plz help me?

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Posted on Oct 20, 2009

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Think ur timing is off-go bac n reset it -could hav slipped wen u titend the sproket n crank-hook a compression tester to it-bet its off-TDC can be a touchy sit--inspec spark n fuel area for good measure

Posted on Sep 04, 2009

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After trying to start the bike, remove spark plug, is it wet or dry? dry means carb problem, wet ignition problem.gtting firm till half stroke is normal, as compression is increasing. also make sure you didnt set the cam on wrong stroke, like exhaust instead of compression.

Posted on Sep 04, 2009

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1 Answer

Hi trying to set the timing on my j1 elantra its a 16 valve and each cam has two marks on my question is what positions should the cam lobes be at when timing is supposed to be correct.thanks

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2006 Yamaha TTR 125E - carb not getting gas

Hi, Kevin always check fuel flow first to isolate the problem area otherwise the usual suspects are:
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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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1 Answer

I just changed my head gasket on my 1991 Honda XR250L. Now that I have it rebuild, the bike wont start. I have made sure the piston is at TDC, the cam shaft is placed right. I dont know what is wrong. any...

Their are 2 different top dead centers/TDC ,one is TDC of Exhaust stroke and the other is TDC compression stroke . You must have the TDC compression stroke . At this point -both valvesare closed.  If it is TDC Exhaust stroke You will be @ a point where the Exhaust valve is just closed and the Intake valve is just opening.After you have established the proper relation of the crankshaft and Camshaft ,you must do ignition timing.   

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1 Answer

I have a 2004 Yamaha TTr 125 with a bent exhaust valve. What other parts may I have to replace as a result of this??

Usually nothing.
The valves usually bend easily , and the connecting rod bearing usually can take it.
With bad luck, you could have cracked the piston, bent the rod, squashed the bearing, damaged the crank, and worn the valve guide.
You can tell if the guide is warn by inserting a new valve and seeing it is rocks side to side too much.
Of course the real questions is how you threw the timing chain and allowed the valve to get bent?

Jan 24, 2011 | 2002 Yamaha TT-R 125

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It will not start and it backfire after valve adjustment. did i put the cams back the wrong way?

did u hav piston @tdc power stroke-valves shud slightly clic with ur hand after ajust-mite hav performed it at exhaust stroke! let me know

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Bike wont start

Hi , This sounds suspiciously like a valv problem. Maybe a valve got bent and is stuck open. If you are mechanicly inclined , are you up to the job of removing the rocker cover for a look?? If you are do this and with the spark plug removed turn the engine over and see what the valves etc are doing. Also worth checking is , your cam chain is ok, valve timing.
Is there any binding when the piston reaches TDC. Is it maybe hitting a valve?
If you are not sure about this stuff tho. Take it to a shop.
Hope this helps.

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Yamaha TTR 125 L won't idle

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